[Coco] Multi-Pak Interface

[rietveld rietveld]

A quote from Cloud 9's web site

Multi-Pak PAL Upgrade
[http://www.frontiernet.net/~mmarlette/Cloud-9/Images/MPI%20PAL.jpg]
Upgrade Your Multi-Pak To Work With The CoCo 3

This upgrade allows Radio Shack's 26-3024 Multi-Pak to work properly with the CoCo 3'. Without this modification, the Multi-Pak and CoCo 3's memory map overlap and can cause unpredictable results, possibly even data corruption under certain conditions.

If you're running an non-upgraded 26-3024 Multi-Pak with a CoCo 3, don't take a chance. Installation of the upgrade is easy -- no soldering is required.

Does My Multi-Pak Need This Upgrade?

Here's a simple test that will determine if your Mulit-Pak has already been upgraded to work with a CoCo 3. From BASIC's OK prompt, type PRINT PEEK(&HFF90) and press ENTER. If 126 is returned then the Multi-Pak has been upgraded. If it returns 255 then it has NOT been upgraded.

Sent via BlackBerry Hub+ Inbox for Android<http://play.google.com/store/apps/details?id=com.blackberry.hub>
From: coco at maltedmedia.com
Sent: November 19, 2022 3:25 PM
To: coco at maltedmedia.com
Reply-to: coco at maltedmedia.com
Cc: bill.gunshannon at hotmail.com
Subject: [Coco] Multi-Pak Interface


I am digging thru stuff as I get ready to set up a couple OS9
systems for some fun projects here and I came up with a question.

I have two Multi-Paks.  One of each model 26-3024 and 26-3124.
The seals on both are broken so I know they were opened up.
The question is: Is there any way to tell if they have been
upgraded or not?  One of them merely involved a single, plug-in
chip change (a PAL) and I don't remember what the other needed.
I think mine may have been both upgraded but I really can't
trust my memory any more.  So, any suggestions?

bill

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